Pseudo RNG Abuse for Eggs in Pokémon X & Y

Yes, it’s actually happening! The credit for it goes to Japanese players who discovered that IVs of the egg are determined before the parents are even deposited in the Day-Care. Sounds pretty crazy, but believe me, it works!

Prerequisites

In order to be 100% sure about what IVs and from which parent are inherited by the egg, you need to have following things:

A pair of Test Parents from any egg group that both have all different IVs. The best way to find them out is to go to the Battle Institute (Lumiose City, Northern Boulevard) as their level will be set to 50 and the results will be very accurate. If you don’t know the exact EV spreads of your pair, just erase them with a Reset Bag. Note that if you don’t have any 31 IVs among your Test Parents, you have a higher chance of spotting a hex flawless spread as the stat that’s not inherited is random. Important: Inheritance can differ for Pokémon with different gender ratio. It’s recommened to use Test Parents with the same gender ratio as the target. Personally, it happened to me only when I’ve been breeding genderless Pokémon, but there were reports of the shakiness for other Pokémon as well.

Destiny Knot (2nd floor, Cyllage City Hotel) and Everstone (Geosenge Town, given by a Scientist in leftmost house).

A Pokémon with either Flame Body or Magma Armor ability and a Pokémon that can use HM02 Fly (Fletchinder and Talonflame are your best bets as they both and Fly and have Flame Body).

A bunch of Pokémon you want to RNG with at least 2/3 perfect IVs. Make sure that the female (or Male if breeding with Ditto) has the desired Ability. There’s a 60% chance that the offspring will inherit mother’s Ability.

The Process: Practice

Put your Test Parents in the Day-Care. One of them must hold Destiny Knot.

Ride your bike outside the Day-Care until Day-Care Man gets an Egg for you (he’ll be facing down, towards the road).

Take and hatch the Egg.

Go to the Battle Institute (Lumiose city, Northern Boulevard) and take a test. Don’t worry, you don’t have to save your game.

Go to your hatched Pokémon’s Summary and calculate its IVs.

Write down which IVs have been inherited and from which parent.

For future reference, you might want to write down the stats of the hatched Pokémon to save time when RNGing next time.

If you’re satisfied with the inheritance spread you’ve obtained, reset the game and swap the Test Parents with another couple that has perfect IVs matching your inheritance spread (use Everstone to ensure you get the right nature). Hatch the egg and congratulations! You’ve just successfully RNGed a Pokémon in X/Y!

If you didn’t get desired spread, reset your game, repeat Step 2 but instead of getting the Egg from the Day-Care Man, reject it and save the game. Repeat Steps 3-7. In case you didn’t get desired Ability with your final parents, you need to repeat the process.

The Process: Example

My Test Parents are a pair of Sunkern:

(M)

Nature:

Bold

Stat

IV

HP

2

Atk

16

Def

30

SAtk

21

SDef

9

Spe

2

(F)

Nature:

Serious

Stat

IV

HP

4

Atk

11

Def

12

SAtk

0

SDef

26

Spe

7

The hatched Sunkern has Hardy Nature and following stats at level 50: 92/43/49/50/48/36. I calculate IVs and get result of:

Nature:

Hardy

Stat

IV

HP

4

Atk

16

Def

30

SAtk

31

SDef

26

Spe

2

I try to match them and instead of exact IVs, I put X for the random non-inherited IV, M for Male’s IV and F for Female’s IV and get: F/M/M/X/F/MI search among all the Pokémon I’d like to breed for a Female with 31 IVs in HP and Special Defense and a Male with 31 IVs in Attack, Defense and Speed. I reset the game and take back my Sunkern couple. I go to the PC and find a 31/x/x/31/31/31 Bold Female Intimidate Mawile and an x/31/31/31/x/31/ Adamant Male Floatzel. Since I want to have an Adamant Mawile, I put my Everstone on Floatzel and Destiny Knot on Mawile. A 31/31/31/31/31/31 Adamant Intimidate Mawile is my goal.

(M)

Nature:

Adamant

Stat

IV

HP

x

Atk

31

Def

31

SAtk

x

SDef

x

Spe

31

(F)

Nature:

Bold

Stat

IV

HP

31

Atk

x

Def

x

SAtk

x

SDef

31

Spe

x

I ride until I get an egg from Day-Care Man, I hatch it, check the Ability and since it’s the desired Intimidate, I go to the Judge. He says that my Mawile’s overall potential is outstanding and its HP as well as its Atk, Def, SpAtk, SpDef and Speed “simply can’t be beat!” which means all its IVs are 31.

136 Responses to Pseudo RNG Abuse for Eggs in Pokémon X & Y

I should point out that you can save a lot of time if you use 31\31\31\31\31\31 and 0 test parents. Since the Judge now mentions whether you have a 0 in an IV, you can easily use him to determine which parent passed down which IV without needing to use a stat calculator.

Yeah it’s funny, I use an imperfect pair of magikarps, and even though they have different IVs from one another, on the rare occasion a random IV will match one of them and confuse me as to which one is the random lol.

I get how this works, but there is something I´m interested in.
In your example, you got a mawile with 31 satk, though it wasn´t set by inheritance.
So I wonder if you just got lucky or can try to breed the Egg on different times to get a different IV stat for the randomly chosen stat?

Is the M and F inheritance based on a timer 0 of some sort? Or a random function? Just wondering, because if I hatch and egg and find that the inheritance is m/f/f/f/x/m (for example) and I soft reset my game, then the next egg I get, regardless of procedure, should be a pokemon with the inheritance m/f/f/f/x/m?

@Darkscythe96 – my mistake. I fixed the error. Thanks for pointing that out!

@Zefrin – I don’t know how the egg is generated from the theoretical/game code side. The game generated an Egg inheritance spread right after you receivean egg from the Day-Care Man. So yes, it’s generated as soon as you take the previous egg and it stays the same until you pick another egg.

As far as I can tell, based off 50-50 gender ratios only, the gender and ability is predicted by whatever your “test” Pokemon are, which leads me to think gender and ability slot are locked with the inheritance order, so it’s generated and locked as well. At the least I haven’t seen any deviation yet, could just as well be I’m getting lucky since again, they’re 50-50 mons. The random IV isn’t locked though, so you could theoretically get an order you like and just SR until that random stat is a 31 (1/32 chance).

Anyone ever test just how long a game will hold an inheritance order? Is it indefinite or will it eventually go to a new one?

I can also confirm that it is locked. I reset three times and the (random) 0IV stayed the same. It wouldn’t be the first time I hit a 1/32768 or so chance in Pokemon, but it seems like pretty solid proof to me.

I can also confirm that it is locked. I reset three times and the (random) 0IV stayed the same. It wouldn’t be the first time I hit a 1/32768 or so chance in Pokemon, but it seems like pretty solid proof to me.

What I meant was that the range of the random IV wasn’t locked, but that whichever stat is the random IV is locked, if that makes sense? IE, in a given inheritance order, Atk will always be the “random” IV stat, but that number from 0-31 isn’t locked.

What I meant was that the range of the random IV wasn’t locked, but that whichever stat is the random IV is locked, if that makes sense? IE, in a given inheritance order, Atk will always be the “random” IV stat, but that number from 0-31 isn’t locked.

What I meant was that the range of the random IV wasn’t locked, but that whichever stat is the random IV is locked, if that makes sense? IE, in a given inheritance order, Atk will always be the “random” IV stat, but that number from 0-31 isn’t locked.

For any given Egg, the random stat will always be the same random stat (e.g. Atk, Def…), and it will always be the same value (e.g. 0, 31, 30…) until you generate the next Egg, when everything gets scrambled again. The next Egg could have Def be an un-inherited stat, with 18 as it’s IV.

What I meant was that the range of the random IV wasn’t locked, but that whichever stat is the random IV is locked, if that makes sense? IE, in a given inheritance order, Atk will always be the “random” IV stat, but that number from 0-31 isn’t locked.

For any given Egg, the random stat will always be the same random stat (e.g. Atk, Def…), and it will always be the same value (e.g. 0, 31, 30…) until you generate the next Egg, when everything gets scrambled again. The next Egg could have Def be an un-inherited stat, with 18 as it’s IV….
As far as I know. Will be testing soon.

What I meant was that the range of the random IV wasn’t locked, but that whichever stat is the random IV is locked, if that makes sense? IE, in a given inheritance order, Atk will always be the “random” IV stat, but that number from 0-31 isn’t locked.

What I meant was that the range of the random IV wasn’t locked, but that whichever stat is the random IV is locked, if that makes sense? IE, in a given inheritance order, Atk will always be the “random” IV stat, but that number from 0-31 isn’t locked.

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